Abstract: Disclosed is a seat rail pair (2) for adjustment of a vehicle seat (8), in particular of a motor vehicle seat, in an adjustment direction (x), comprising a guide rail (10) extending parallel to the adjustment direction (x) for fastening to a vehicle floor, and a fastening rail (21), which is adjustably guided on the guide rail (10) in the adjustment direction (x) for fastening the vehicle seat (8), wherein an energy absorber element (5) is provided in a path, which introduces the force acting on the vehicle seat (8) into the vehicle structure, which energy absorber element permits a movement of the vehicle seat in the adjustment direction (x) under plastic deformation when a predetermined value of the force is exceeded.

Abstract: A joining device, especially for concrete piles, comprises at least one wedge (12). In order to provide a joining device which is strong, cheap in production and very simple in use, at least the one pile end has a female joint (2) for receiving a male joint or a male joint similar tension body (10) at the during the joining adjacent co-operating pile end. The female joint(s) (2) and the male joint/the male joint similar tension body (10) have through-going cavities or holes (9',11) for at least one common lateral wedge (12).